Answer:
It comes in the form of electromagnetic radiation:
One EarthScientist wrote: "The ozone layer at altitudes of 12 to 19 miles up in the lower atmosphere, absorbs very energetic solar ultraviolet radiation, thereby protecting life on Earth from this very "hot" DNA-destroying radiation. When the concentration of ozone is reduced, more ultraviolet radiation is observed to reach the Earth's surface, increasing the risk of sunburn and skin cancer. There is no disagreement among climate scientists about this, but I went one step further by deducing that this increased influx of "super-hot" ultraviolet radiation also actually warms the Earth." - Peter Langdon Ward